ar71xx: Add OTP support for AR934x

The patch 523-MIPS-ath79-OTP-support only supports the OTP offsets for
AR933x chips, which has changed on newer platforms such as the AR934x.
The follwoing change is to add support for reading the OTP on the
AR934x. Tested on an Aerohive AP-121.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Chris Blake <chrisrblake93@gmail.com>

target/linux/ar71xx/patches-4.4/641-MIPS-ath79-fix-AR934x-OTP-offsets.patch

@@ -0,0 +1,66 @@
+--- a/arch/mips/ath79/dev-wmac.c	2017-02-12 19:49:21.158142253 +0100
++++ b/arch/mips/ath79/dev-wmac.c	2017-02-12 21:01:51.206198122 +0100
+@@ -232,15 +274,27 @@ static void qca956x_wmac_setup(void)
+ 	ath79_wmac_data.get_mac_revision = ar93xx_get_soc_revision;
+ }
+
++#define AR93XX_WMAC_SIZE \
++	(soc_is_ar934x() ? AR934X_WMAC_SIZE : AR933X_WMAC_SIZE)
++#define AR93XX_WMAC_BASE \
++	(soc_is_ar934x() ? AR934X_WMAC_BASE : AR933X_WMAC_BASE)
++
++#define AR93XX_OTP_BASE \
++	(soc_is_ar934x() ? AR934X_OTP_BASE : AR9300_OTP_BASE)
++#define AR93XX_OTP_STATUS \
++	(soc_is_ar934x() ? AR934X_OTP_STATUS : AR9300_OTP_STATUS)
++#define AR93XX_OTP_READ_DATA \
++	(soc_is_ar934x() ? AR934X_OTP_READ_DATA : AR9300_OTP_READ_DATA)
++
+ static bool __init
+ ar93xx_wmac_otp_read_word(void __iomem *base, int addr, u32 *data)
+ {
+ 	int timeout = 1000;
+ 	u32 val;
+
+-	__raw_readl(base + AR9300_OTP_BASE + (4 * addr));
++	__raw_readl(base + AR93XX_OTP_BASE + (4 * addr));
+ 	while (timeout--) {
+-		val = __raw_readl(base + AR9300_OTP_STATUS);
++		val = __raw_readl(base + AR93XX_OTP_STATUS);
+ 		if ((val & AR9300_OTP_STATUS_TYPE) == AR9300_OTP_STATUS_VALID)
+ 			break;
+
+@@ -250,7 +304,7 @@ ar93xx_wmac_otp_read_word(void __iomem *
+ 	if (!timeout)
+ 		return false;
+
+-	*data = __raw_readl(base + AR9300_OTP_READ_DATA);
++	*data = __raw_readl(base + AR93XX_OTP_READ_DATA);
+ 	return true;
+ }
+
+@@ -326,7 +380,7 @@ bool __init ar93xx_wmac_read_mac_address
+ 	int mac_start = 2, mac_end = 8;
+
+ 	BUG_ON(!soc_is_ar933x() && !soc_is_ar934x());
+-	base = ioremap_nocache(AR933X_WMAC_BASE, AR933X_WMAC_SIZE);
++	base = ioremap_nocache(AR93XX_WMAC_BASE, AR93XX_WMAC_SIZE);
+ 	while (addr > sizeof(hdr)) {
+ 		if (!ar93xx_wmac_otp_read(base, addr, hdr, sizeof(hdr)))
+ 			break;
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h	2017-02-12 20:22:32.185209249 +0100
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h	2017-02-12 20:42:21.037382287 +0100
+@@ -172,6 +172,13 @@
+ #define AR9300_OTP_STATUS_SM_BUSY	0x1
+ #define AR9300_OTP_READ_DATA	0x15f1c
+
++#define AR934X_OTP_BASE					0x30000
++#define AR934X_OTP_STATUS				0x31018
++#define AR934X_OTP_READ_DATA				0x3101c
++#define AR934X_OTP_INTF2_ADDRESS			0x31008
++#define AR934X_OTP_INTF3_ADDRESS			0x3100c
++#define AR934X_OTP_PGENB_SETUP_HOLD_TIME_ADDRESS	0x31034
++
+ /*
+  * Hidden Registers
+  */